I am confused as to who you are talking about. Do you mean the real person that the movie, The Exorcism of Emily Rose, was about? because there are a lot of people you could be talking about. You have to be a bit more specific.

Valentin Fleischmann was a Frankish Catholic priest who lived in the 16th century. Fleischmann's priesthood lasted from around 1572 to 1575. He had been defrocked and excommunicated from the Catholic church due to his drunken behavior. Fleischmann was accused of assault and murder. According to the priests who performed the exorcism of Anneliese Michele, a young German woman, Fleischmann was the sixth demon discovered to be inhabiting Anneliese's body. Because Anneliese was a Catholic living in Germany, she may have learned about Valentin Fleischmann during her studies as the Franks were Germanic and Fleischmann lived in Ettlebin, Bavaria. This information may have influenced the supposed presence of Fleischmann in demonic form.
During the exorcism, a total of six demons were reported to be in possession of Anneliese's body. The other five, aside from Fleischmann, included Lucifer, Roman Emperor Nero, Adolf Hitler, Cain and Judas Escariot. There has been speculation that Valentin Fleischmann represented the corruption of the priesthood and of the Catholic church. Father Arnold Renz and Pastor Ernst Alt performed nearly 70 exorcisms on Anneliese prior to her death in 1976. Anneliese's parents, Josef and Anna Michel, were charged with negligent homicide. Renz and Alt were also charged. Anneliese died of malnutrition and dehydration, weighing just 68 pounds when she died.

Yes Emily rose Was possessed by demons, her full name is Anneliese Michel ,i think it was

The above post appears to have been copied and pasted from another site without proper attribution. This is considered plagiarism and is against the rules of this site.

It should be noted, and would have been if the whole copied post were present that both the medical community and the Catholic Church stated that this was not a case of demonic possession but rather a case of mental illness. There is no evidence to support the claim of demonic possession, there is only folklore. Remember that mental illness was little understood in the 1500's and superstition ran rampant